new motor ideas block help

well if all goes well I plan to step up from the 451 motor in the next year are so...so I am looking in to race blocks price and whats going to work the best...I am sure I would like the aluminum but looking for all the pros and cons does and don't of them all...here is what I am thinking for a motor..
512 or 540 low deck
max ported -1 heads
right now I have a indy 400 intake 4500 top with rons toilet injection on the 451
this motor will have at lease 1 kit but looking in to 2 fogger
right now I have a 727 and may stay with that or glide if needed
ford 9 with 456 aluminum center
tire will be 10.5 car is chassis car weigh about 23/2400lbs
glass front end doors bumper and deck lid with lexan windows..
what motor set up would be the best...512 or 540 and what block looking for max hp